Adding on rerolls

So, in our campaign a character has to roll for corruption, essentially it's 1d20 vs a target number, re-roll failures till you succeed, you get +1 on each successive attempt, add up the total number of failures.  This formula comes close for a target of 18 but doesn't include the +1, does anyone know how to do that?  (apparently less than counts as less than or equal) /roll {1d20!<17}<17

Not possible without an API script.

Silvyre may come by with some crazy macro magic, but I'm not aware of a way to do what you're asking.

Ok, thanks.  I'll probably change the mechanic instead.

Without the API, you could list out a bunch of rolls like so: &{template:default} {{name=Roll for corruption }} {{ Target Number ?{Target Number|18}= [[ 1d20 + 0 ]] [[ 1d20 + 1 ]] [[ 1d20 + 2 ]] [[ 1d20 + 3 ]] [[ 1d20 + 4 ]] [[ 1d20 + 5 ]] [[ 1d20 + 6 ]] [[ 1d20 + 7 ]] [[ 1d20 + 8 ]] [[ 1d20 + 9 ]] [[ 1d20 + 10 ]] }} Or, you could use a macro to make manually rerolling easier: ! [[ 1 &{tracker} ]] &{template:default} {{name=Roll for corruption }} {{Target Number=[[ ?{Target Number|18} ]] }} {{Result=[[ 1d20 ]] }} {{[Reroll](!
 [[ 1d20 + @{tracker|} ]] 
! / [[ 1 &{tracker:+} ]]) }} The above macro hijacks the Turn Tracker entry of a selected Token, so it's best used by the GM or outside of combat.